a. An open circuit occurs when there is no current flow, while a short circuit occurs when there is too much current flow.
b. An open circuit occurs when there is too much current flow, while a short circuit occurs when there is no current flow.
c. An open circuit and a short circuit are the same thing.
d. An open circuit occurs when a wire is disconnected, while a short circuit occurs when two wires are accidentally connected.
Answer: d. An open circuit occurs when a wire is disconnected, while a short circuit occurs when two wires are accidentally connected.